AXIAL COMPRESSION BEHAVIOR OF THIN-WALLED MILD STEEL TUBES SUBJECTED TO AXIAL IMPACT S.K. Tak , M.A. Iqbal Indian Institute of Technology Roorkee, Roorkee, India [email protected] Abstract. The finite element computations were performed on ABAQUS/Explicit solver to study the effect of wall thickness on axial crushing and energy absorption of the mild steel tubes under axial impact. Circular tube (60 mm diameter) and square tube (47.34 mm size) with varying wall thicknesses (1.1, 1.5, 2, 2.5, and 3 mm) were impacted axially by 5 kg projectile. A comparative study has also been carried out on axial compression behavior of tubes with circular and square tubes with equivalent section areas. The constitutive and damage behavior of the mild steel was modelled using the Johnson-Cook material model. The validation of the computational model was carried out by performing the experiments on 60 mm diameter circular tube under the axial impact of 5 kg projectile. The maximum axial compression of the circular and square tubes has been found to be decreased with an increase in the wall thickness of the tubes, however, the absorbed energy does not show any significant influence with the change in the wall thickness of the tubes. The maximum axial compression of the square tubes was found to be higher than the circular tubes for thicknesses 1.1 and 1.5 mm. On the other hand, the axial compression of the circular tubes was found higher at higher thicknesses beyond 1.5 mm. Keywords: axial deformation, energy absorber, crashworthiness, thin-walled tubes Acknowledgements. The first author acknowledges All India Council for Technical Education (AICTE) and Q.I.P. Centre, Indian Institute of Technology Roorkee, for providing the scholarship for his doctoral studies at the I.I.T. Roorkee, Roorkee, India. First author is also thankful to Institute computer centre, I.I.T. Roorkee, for providing the computational facilities. Citation: Tak S.K., Iqbal M.A. Axial compression behavior of thin-walled mild steel tubes subjected to axial impact // Materials Physics and Mechanics. 2021, V. 47. N. 5. P. 681-696. DOI: 10.18149/MPM.4752021_3. 1. Introduction The safety of drivers and passengers is of utmost priority in automotive structures. Therefore, crashworthiness criteria should be considered in the design of such vehicles. Many researchers have suggested that energy absorber elements can be used to mitigate these impact problems. By the use of such energy-absorbing elements, structural deformations are ensured and crash energy is converted into strain energy for safety. Nowadays, thin-walled metal tubes are the most popular energy absorbers in different industries due to their ease of construction, crashworthiness, lighter weight, and economic significance. The axial dynamic compression behavior of uniform thickness, functionally graded thickness, and stepped thickness tubes under axial impact was studied experimentally and numerically [1]. It was Materials Physics and Mechanics 47 (2021) 681-696 Research article Received: July 19, 2021 Accepted: November 1, 2021 http://dx.doi.org/10.18149/MPM.4752021_3 © S.K. Tak, M.A. Iqbal, 2021. Peter the Great St. Petersburg Polytechnic University This is an open access article under the CC BY-NC 4.0 license (https://creativecommons.org/li-censes/by-nc/4.0/)
AXIAL COMPRESSION BEHAVIOR OF THIN-WALLED MILD STEEL TUBES SUBJECTED TO AXIAL IMPACT
Jun 16, 2023
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